Grinding machine



Felf 24, 1931.

H. H. lASBRIDGE GRINDING MACHINE Filed Jan. 28. 1929 Patented Feb. 24,1931v UNITED srA'rEs Parent orrics HARRY HALE-S ASBRIDGE, 0FASHTON-ON-ME'RSEY, ENGLAND', ASSIG-NOR T0A THE CHURCHILL MACHINE TOOLCOMPANY LMITED, OF BROADHEATH, NEAR MAN- CHESTER, ENGLAND, A BRITSHCOMPANY,

GRIN DING MACHINE Application filed January 28, 1929, Serial No.335,2'02l.,A and-in; Great Britain February 29, 1928.

This invention relates to grinding inachines, particularly of the typeemployed for the circular grinding of rolls for rolling mills or forcalendering and like machines. The said rolls may require to be finishedwith either a parallel, a convex or a concave surface and the grindingmachines for such inishing are, in known practice, provided with agrinding wheel in a relatively iiXed position whilst the roll is carriedon a swivelling member mounted on a reciprocating table.

The object of this invention is to provide improved means for effectingthe swivelling of the roll or work support and for the ready andreliable variation of the amount and direction of such swivelling tosuit varying requirements.

The invention comprises the improved combinations and arrangements ofparts hereinafter described and claimed.

Referring to the accompanying sheet of explanatory drawings Figure l isa plan and Figure 2 an end view representing in diagrammatic form oroutline a roll grinding machine with this invention applied thereto.

Figure 3 is an end view showing the rack mechanism to a larger scalethan that of Figures l and 2.

Like reference letters in the dierent views indicate like parts.

In the application of the invention as illustrated by the drawings,there is provided be neath the reciprocating table a. of the machine arack Z) which is lined to said table and an auxiliary rack c which iscapable of a sliding movement relatively to said table. The said racksare respectively in mesh with pinions Z and e having diiierent numbersof teeth thereon which are preferably formed integrally with each otherand mounted on the shaft Attached to one end of the auxiliary slidingrack c is a block g (shown at the Alett hand end of Figure l) adapted toslide in the guide-ways Zt of the table a. The said block g has arrangedtherewith a grooved disc z' capable of being set with its groove eitherparallel or in alignment with the longitudinal centre line of the tablea of a swivelling movement about a cent-re as m.

As the table a is reciprocated, the auXiliary or sliding' rack' cimparts to the'block g a sliding movement at a rate differing from therate of the table movement. In the eX- ample illustrated the rate ofmovement of the block g will exceed thatl of the table because thepinion e has a larger number of teeth than the pinion cZ. With thegrooved disc t' set at an angle to the line of travel of the table a, asindicated at Figure l, the end of the lever j engaged in the groove willhave a corresponding angular movement about its pivot. The end 7c of thesaid lever will therefore operate the swivelling work support Z so thatthe roll a or the work mounted upon said support and rotated in anyconvenient and ordinary manner in contact with the grinding wheel o,will have a spherical contour imparted to it, either convex or concave,depending on the angle to which the groove of the disc z' may be set.

For the correct movement of both ends of the swivelling work support Z(which may be of considerable length) and the prevention of lag or lostmotion due to bending or other stresses, the lever j has an extension orbell crank arm p which is connected by the rod g to the lever r at theopposite end of the swivelling support Z.

AvWhen the reciprocatory table a is operated otherwise than througlrrack and pinion mechanism, as for example by a screw and nut device orby hydraulic power mechanism, the grooved disc z' with associated partsfor effecting the swivelling movements of the work support Z arearranged therewith in any convenient manner.

`What l claim is l. In roll grinding machines., in combination, agrinding wheel, a slide reciprocable upon the machine bed, a rollsupport swivelling about a vertical pivot upon said slide, guide ways inan extension of said slide, a block reciprocable in said guide ways, andmeans for its reciprooation relatively to the slide, a grooved-disccapable of being swivelled in said block and set at any angle to thedirection of reciprocation of the block, and means engaging the groovein said'disc and operatively connected to the opposite ends of said rollsupport for imparting swivelling movements to the latter.

2. In roll grinding machinesA as claimed 1n claim l, means forreciprocating the slide and the block in the guide ways in said slide,

comprising a rack secured to said slide and a second rack guided in saidslide and connected to said block, and two interconnected drivingpinions having different numbers of teeth engaging said two racks.

3. In roll grinding machines as claimed in claim l, the means forswivelling the roll support from the grooved disc, comprising a leverpivoted on the slide engaging said f groove and also one end of saidroll support,

an arm upon said lever, a further lever also pivoted upon the slideengaging the other end of saidroll support,-and a rod connecting saidarm and said further lever.

In testimony whereof I have signed my name to this specication. HARRYHALES ASBRIDGE.

